This diagram from a 1967 documentation shows how to switch high voltage neon lamps with 5V TTL outputs. The circuit can be adapted to function as a shield.
This 1960s Signalite circuit uses two SCRs to achieve full wave control. The trigger elements are...
This voltage controlled oscillator uses a varicap to change the frequency. Usin a 100 turns coil...
July 2017 - Mouser Electronics announced the availability of its new ISO771x digital isolators...